To open fastboot mode on your OPPO A37, you can use either a simple physical button shortcut or a computer-based command. Method 1: Physical Button Shortcut
If you can reach Recovery Mode, you can often jump to Fastboot from there. how to open fastboot mode on oppo a37 better
Step 2: Press and hold the Volume Up and Power buttons simultaneously for several seconds. To open fastboot mode on your OPPO A37
Enable Developer Options: Go to Settings > About Phone and tap Build Number 7 times. Wait for vibration to confirm shutdown